You will hear lots of conflicting comments about both, at the end of the day they are both great kites and you will learn the little bug bears of each one. I know its not always possible, but do try and have a fly of both.
I would say that the frenzy does not inflate / stay inflated as well as the sabre, so if you are trying to fly it in wind that not really strong enough it does have the tendancy to tip tuck. This happens on my 12m, but not on the 7m as its no where near as wide. Cant comment on the 10m.
I have found that the frenzy is better in the gusts though, its not as punchy as the sabre and gives you more time to let the bar out to shed some power.
Yep, ive seen that happen.
The saftey is a little better on the frenzy as well.
I found the sabre easier to learn to fly, but size for size has a little less pull.
Im sure there will be a frenzy 06 at some point, so hopefully there will be some 05's around second hand soon. I'm up for a 10m too
Hope this helps, Matt.